Battery charger for a portable telephone



FIG. 1 is a top and left side perspective view of the battery charger for a portable telephone showing our new design;

FIG. 2 is a right side view thereof;

FIG. 3 is a bottom view thereof; and,

FIG. 4 is a rear view thereof.

The broken line showings in FIGS. 1, 3, and 4 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a battery charger for a portable telephone, as shown and described. 